dagger: add page (#22462)

pages/common/dagger.md

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+# dagger
+
+> Programmable CI/CD engine that runs pipelines in containers locally, in CI, or in the cloud.
+> More information: <https://docs.dagger.io/reference/cli>.
+
+- Initialize a new module with the specified SDK:
+
+`dagger init --sdk {{go|python|typescript}} {{path/to/module}}`
+
+- Prepare a local module for development:
+
+`dagger develop`
+
+- List available functions in the current module:
+
+`dagger functions`
+
+- Call a function on the current module:
+
+`dagger call {{function_name}}`
+
+- Install a module dependency from a Git repository:
+
+`dagger install {{github.com/user/repo}}`
+
+- Update a module's dependencies:
+
+`dagger update`
+
+- Display help:
+
+`dagger {{[-h|--help]}}`
+
+- Display version:
+
+`dagger version`